若x、y、z满足3x+7y+z=1和4x+10y+z=2001,则分式2000x+2000y+2000z/x+3y的值为_.

问题描述:

若x、y、z满足3x+7y+z=1和4x+10y+z=2001,则分式

2000x+2000y+2000z
x+3y
的值为______.

由x、y、z满足3x+7y+z=1和4x+10y+z=2001,
得出:

2(x+3y)+(x+y+z)=1
3(x+3y)+(x+y+z)=2001
,解得:
x+3y=2000
x+y+z=−3999

2000x+2000y+2000z
x+3y
=
2000(x+y+z)
x+3y

=
2000×(−3999)
2000
=-3999.
故答案为:-3999.